Hi Chezza, Shedding normally happens about 4-5 days after the eyes clear mate, so your MD is due, perhaps just a bit late. You could assist by doing a few things, from memory its pretty dry where you are,
try giving it a nice jacuzzi in a tub of tepid water for an hour or so, not too deep, or you could line the tub with wet spaghum moss or a wet towel, for a few hours to create high local humidity. It may just be a bit dry.
Never put a put a python in a wet bag though, it restricts air flow. see how it goes.
occasionally they can fail to slough, this can be for a number of reasons, mainly lack of humidity, or a slight tear in the old skin can cause the fluids beneath to dry up., Id try the soaking, or wet towel for a few hours, make sure something rough is provided in the enclosure and maybe upgrade to a bigger water bowl or place the bowl closer the heatr to create more humidity.
some like to mist daily when cloudy eyes appear.
If you havent missed more than one slough, dont panic, it will come off with the next slough.
They can go long times between sloughs it really depends on growth. Our darwin is few and far between too. no great cause for concern.

P.s, nice to see you back here, say hi to Dave for me eh. Still waitin on some pics sweetheart!